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Cisco Catalyst Switch Module 3110 and 3012 for IBM BladeCenter Software Configuration Guide
OL-12189-01
Chapter 24 Configuring IPv6 MLD Snooping
Configuring IPv6 MLD Snooping
Default MLD Snooping Configuration
Table 24-1 shows the default MLD snooping configuration.
MLD Snooping Configuration Guidelines
When configuring MLD snooping, consider these guidelines:
• You can configure MLD snooping characteristics at any time, but you must globally enable MLD
snooping by using the ipv6 mld snooping global configuration command for the configuration to
take effect.
• On a Catalyst Switch Module 3110, when the IPv6 multicast router is a Catalyst 6500 switch and
you are using extended VLANs (in the range 1006 to 4094), IPv6 MLD snooping must be enabled
on the extended VLAN on the Catalyst 6500 switch in order for the switch to receive queries on the
VLAN. For normal-range VLANs (1 to 1005), it is not necessary to enable IPv6 MLD snooping on
the VLAN on the Catalyst 6500 switch.
• On a Catalyst Switch Module 3012, when the IPv6 multicast router is a Catalyst switch and you are
using extended VLANs (in the range 1006 to 4094), IPv6 MLD snooping must be enabled on the
extended VLAN on the Catalyst switch in order for the switch to receive queries on the VLAN. For
normal-range VLANs (1 to 1005), it is not necessary to enable IPv6 MLD snooping on the VLAN
on the multicast router.
• MLD snooping and IGMP snooping act independently of each other. You can enable both features
at the same time on the switch.
Table 24-1 Default MLD Snooping Configuration
Feature Default Setting
MLD snooping (Global) Disabled.
MLD snooping (per VLAN) Enabled. MLD snooping must be globally enabled for VLAN
MLD snooping to take place.
IPv6 Multicast addresses None configured.
IPv6 Multicast router ports None configured.
MLD snooping Immediate Leave Disabled.
MLD snooping robustness variable Global: 2; Per VLAN: 0.
Note The VLAN value overrides the global setting. When the
VLAN value is 0, the VLAN uses the global count.
Last listener query count Global: 2; Per VLAN: 0.
Note The VLAN value overrides the global setting. When the
VLAN value is 0, the VLAN uses the global count.
Last listener query interval Global: 1000 (1 second); VLAN: 0.
Note The VLAN value overrides the global setting. When the
VLAN value is 0, the VLAN uses the global interval.
TCN query solicit Disabled.
TCN query count 2.
MLD listener suppression Disabled.